装配式隧道接头冲击动力响应特性

Impact dynamic response characteristics of assembled tunnel joints

为探究3种装配式隧道接头(自重榫卯接头、螺栓榫卯接头、钢板榫卯接头)在冲击荷载作用下的动力响应特性,采用ABAQUS软件模拟3种接头在冲击荷载作用下的动力响应过程与损伤破坏特征,对比3种接头抗冲击性能。研究结果表明:装配式隧道接头在冲击作用下的响应可分为初始冲击阶段、发展阶段和稳定阶段,在此过程中接头受到冲击力、支反力及惯性力的共同作用;3种接头冲击动力响应特征受冲击质量及速度影响,当冲击质量超过1400 kg且冲击速度超过60 km/h时,接头中心位移、张开量及损伤范围均会显著增加;钢板榫卯接头是3种接头结构中抗冲击性能最优的一种结构形式;在设计装配式隧道结构抗冲击时,需重点加强接头刚度。

To explore the dynamic response characteristics of three kinds of assembled tunnel joints(self-weight mortise-tenon joint,bolt mortise-tenon joint and steel plate mortise-tenon joint)under impact load,ABAQUS software was utilized to simulate the dynamic response process and damage characteristics of three kinds of joints under impact load,and the impact resistance of three kinds of joints was compared.The results indicated that the response of the assembled tunnel joint under impact could be divided into initial impact stage,development stage and stable stage.In this process,the joint was affected by impact force,reaction force and inertia force.The dynamic response characteristics of the three types of joints were influenced by the mass and velocity of the impact.When the impact mass exceeds 1400 kg and the impact velocity exceeds 60 km/h,the central displacement,opening,and damage range of the joints significantly increased.The steel plate tenon and mortise joint was the structure with the best impact resistance among the three types of joints.In the anti-impact design of assembled tunnel structures,it was necessary to focus on enhancing the stiffness of the joints.